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Title: Real Gas Corrections For High Beta Ratio ( 0.25) Critical Flow Venturi Cfv() Installations
Author: Aaron N. Johnson Eric Lemmon
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: For almost 50 years, flow measurement applications usi ng critical flow venturis (CFVs) have relied exclusively on the critical flow function ( * C ) to correct for real gas effe cts. This work shows that * C does not account for all real gas effects. For high beta ratio ( ? 0.25) CFV installations, real gas effects can result in significant mass flow errors even after * C corrections have been made. These errors are attributed to the idealized thermodynamic models (ITMs) used to calculate the st agnation temperature and pressure. The errors in the stagnation temperature and pressure cause errors in * C , and ultimately in the CF V mass flow. For methane gas the mass flow errors exceeded 0.1 % for ? 0.5 at 10 MPa, and are larger than 0.3 % for ? 0.6 at 20 MPa. For CFVs these errors are comparable with the uncertainty of the flow measurement.

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